高Si铁素体/马氏体钢的高温变形行为
High temperature deformation behavior of high Si ferritic/martensitic steel
张家豪 1张珺 1张新昊 1任浩 1张晓新 1燕青芝1
作者信息
- 1. 北京科技大学材料科学与工程学院,北京 100083
- 折叠
摘要
铁素体/马氏体(Ferritic/Martensitic,F/M)钢因具有优异的抗辐照性能和高温力学性能而成为先进核反应堆的候选结构材料.提高Si含量能够改善F/M钢的耐蚀性,但高硅的引入会恶化其热加工性能,因此研究高Si F/M钢的高温变形行为非常重要.在变形温度为 950～1200℃和变形速率为 0.01～10 s-1 的条件下,采用 Gleeble1500 型热模拟试验机对硅含量 1%的10Cr1Si F/M钢进行热压缩模拟试验,研究其高温变形行为.结果表明:在 0.01～0.1 s-1 的低变形速率下,10Cr1Si钢均发生动态再结晶;而在 1～10 s-1 的高变形速率下发生动态回复,在本试验设计参数范围内仅在 10 s-1/950℃变形条件下出现了反常的动态再结晶现象.微观组织分析表明当变形温度较低而变形速率较快时,快速增殖的位错促使奥氏体动态再结晶.计算得到了10Cr1Si钢的Arrhenius本构方程和应变补偿本构模型,试验钢的真应力计算值与试验值吻合良好,可为 10Cr1Si钢的热加工提供指导.
Abstract
Ferric/Martensitic(F/M)steel has become a candidate structural material for advanced nuclear reactors due to its excellent radiation resistance and high temperature mechanical properties.Increasing the Si content can improve the corrosion resistance of F/M steel,but the introduction of high silicon will deteriorate its hot working performance.Therefore,studying the high temperature deformation behavior of high Si F/M steel is very important.Under the conditions of deformation temperature of 950-1200℃and deformation rate of 0.01-10 s-1,a Gleeble1500 thermal simulation testing machine was used to conduct hot compression simulation tests on 10Cr1Si F/M steel with silicon content of 1%,and its high temperature deformation behavior was studied.The results show that dynamic recrystallization occurs in the 10Cr1Si steel at low deformation rates of 0.01-0.1 s-1.However,dynamic recovery occurs at high deformation rate of 1-10 s-1,and abnormal dynamic recrystallization only occurs under deformation conditions of 10 s-1/950℃within the design parameter range of this experiment.The microstructure analysis shows that when the deformation temperature is low and the deformation rate is fast,the rapidly growing dislocations promote dynamic recrystallization of austenite.The Arrhenius constitutive equation and strain compensation constitutive model of the 10Cr1Si steel are calculated,and the calculated true stress values of the experimental steel are in good agreement with the experimental values,which can provide guidance for the hot working of the 10Cr1Si steel.
关键词
高Si铁素体马氏体钢/热压缩模拟试验/高温变形行为/本构方程Key words
high Si ferritic/martensitic steel/hot compression simulation test/high temperature deformation behavior/constitutive equation引用本文复制引用
出版年
2024
NETL
NSTL
万方数据